/*
 * Copyright 2017 Huawei Technologies Co., Ltd
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package io.servicecomb.company.beekeeper;

interface BeekeeperService {

  /**
   * calculates the number of ancestors of a drone (male bee) at specified generation.
   *
   * @param generation the generation of bee ancestors at query
   * @return the number of ancestors
   * @see <a href="http://www.dave-cushman.net/bee/fibonacci.html">Drone Parent Numbers</a>
   */
  long ancestorsOfDroneAt(int generation);

  /**
   * calculates the number of ancestors of a queen (female bee) at specified generation.
   *
   * @param generation the generation of bee ancestors at query
   * @return the number of ancestors
   * @see <a href="http://www.dave-cushman.net/bee/fibonacci.html">Drone Parent Numbers</a>
   */
  long ancestorsOfQueenAt(int generation);
}
